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LB1945D Folha de dados(PDF) 9 Page - Sanyo Semicon Device

Nome de Peças LB1945D
Descrição Electrónicos  Stepping Motor Driver
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Fabricante Electrônico  SANYO [Sanyo Semicon Device]
Página de início  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LB1945D Folha de dados(HTML) 9 Page - Sanyo Semicon Device

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LB1945D
PS No.7633-9/9
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
Simplified Equations for Determining RC Component Values
The equations for setting the RC oscillator circuit rise time (T1) and fall time (T2) are shown below.
T1
≈ 0.44C × R (s)
T2
≈ 0.72 × ( C × R × 1000 )/( R + 1000 ) (s)
(C:220 to 4700pF, R = 10 to 150k
Ω)
The oscillator frequency must be set using the simplified equations shown above.
Note that the triangle wave fall time (T2) is also used as the noise canceller time.
Usage Notes
1. VREF
Since the VREF pin is the input pin for the reference voltage that sets the current, applications must be designed so that
noise does not appear on this pin.
2. Ground pins
Since this IC switches high currents, the following points concerning grounding must be observed.
• The fins on the package rear surface, pins 7 and 8, and pins 21 and 22 must all be grounded.
• Sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit
pattern, and must be physically separated from the small signal system.
• The E pin sense resistor (RE) must be position as close as possible to the IC ground (pin 14).
• The capacitors between VCC and ground and between VBB and ground must be positioned as close as
possible to the VCC and VBB pins on the printed circuit pattern.
This catalog provides information as of April, 2007. Specifications and information herein are subject
to change without notice.
T1
T2
CR
T2
Motor


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